Reuters reports that earlier today Britain had deployed a destroyer to track a Russian aircraft carrier sailing close to its coastal waters, "the latest in a series of such incidents and a reminder of underlying tensions between London and Moscow."

The reason the Russian navy is suddenly a concern to Britain is because the Admiral Kuznetsov, which is capable of carrying up to 26 fixed-wing fighters and 24 helicopters, had completed a deployment as part of Moscow's naval force in the Mediterranean "and was on its way back to its base of Severomorsk in north-west Russia